Muffler construction



T. S. KEMBLE MUFFLER CONSTRUCTION Nbv. 1 7, 1925. 1,561,859

Filed Nov. 2, 192i elongated tubular member Patented Nov. 17, 1925.

UNITED STATES THOMAS S. KEMBLE, OF CLEVELAND, OHIO.

MUFFLER CONSTRUCTION.

Application filed November 12, 1921. Serial No. 514,566.

To all whom it may concern.

Be it known that I, THOMAS S. KEMBLE, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Mufiler Constructions, of which the following is a full, clear, and exact description.

The present invention relates to a mufier for use with internal combustion engines.

In my Patent No. 1,357,992 there is disclosed a muffler which in its general principles of operation is the same as that which is disclosed herein, and in one aspect of the present invention this may be considered as an improvement upon the construction disclosed in the aforesaid patent, the present invention relating to changed features of construct-ion wherein the muflier may be made at less cost, provide a better mechanical structure, and odor less opportunity for mutilation by the user.

In another aspect of the invention, the muflier which is described herein provides a departure in construction from that which is described in my prior patent, and which has been found to eliminate more of the noise due to the exhaust of the engine, which is particularly desirable where the mufller is used on road vehicles.

Reference should be had to the accompanying drawings forming a part of this specification in which Fig. 1 is a perspective view with a portion in section showing a mufller embodying the present invention attached to a supporting member which may be the chassis of a vehicle or any other part of the structure supportin the internal combustion engine with whicfi the muffler is used; Fig. 2 is an elevation with portions in section of a part of the mufller; Fig.- 3 is a section on the line 3-3 of Fig. 2; Fig.- 4 is a section on the line 4-4 of Fig. 2; Fig. 5 is a section on the line 5-5 of Fig. 1; Fig. 6 is a bottom plan view of a portion of the muflier with. a supporting bracket.

Referring to the drawings, 1 indicates an which is preferably made of conical shape.

The tubular member is formed by taking a piece of sheet metal and forming it into the desired conical shape by means well known in the shapin of metal articles, and bringing the free e ges of the sheets to gether as indicated at 2, so that these free edges will engage with each other and then securing the edges together in any desired manner, and it may be stated that spot welding has been found to be a very etlicient and desirable means for securing these overlying edges together.

At one end of the tubular member, or as shown in the drawings at the large end of the cone, there is a neck which comprises a conical portion 3 that connects with or is integral with the material out of which the tubular member 1 is made and from the conical portion 3 there extends a cylindrical portion 4 and this cylindrical portion is provided with a series of longitudinally extending cuts or slits such as indicated at 5. This portion 4 is adapted to receive vthe end of a pipe leading from the exhaust manifold, which pipe is indicated at 6. The before described construction is particularly advantageous because there is a variation in external diameter of pipes even though they are rated as of the same internal diameter, hence by providing the portion 4 with the slots 5, the pipe 6 may be accommodated even though it may be slightl v oversize or slightly undcrsize.

Surrounding the portion 4 which has just been described. is a supporting strap 7. This strap has upwardly extending ears 7 which are adapted to receive a bolt 8. This bolt extends through an arm of a bracket 9 which is carried upon a suitable supporting member, as clearly indicated in Fig. 1.

In the wall of the tubular member 1 there are formed a large number of holes oropenings 10, each of the holes being spaced from the adjacent holes and said holes extending substantially throughout the length of the tubular member 1.

It has been found advantageous to space these holes closer together in the central zone or region of the tubular member and to have them spaced apart greater distances adjacent the opposite ends as shown in Fig. 1 of the drawing.

e gases coming from the exhaust manifold pipe 6 are discharged into the tubular member at one end thereof and find exit therefrom through the holes 10 which are formed in the tubular member and through the open end of the tubular member which is indicated at 1.

The holes in eifect provide a multitude of small exhaust ports thus discharging the exhaust gases against the atmospheric pressure through a large number of exhaust openings and thereby eiiecting a discharge which greatly reduces the noise incident to the discharge of the exhaust gases and at the same time provide a structure in which back pressure is practically eliminated.

For the purpose of providing a support of considerable contact area for the same, the strap member 11 is secured around the body portion at a point between the ends thereof. lfhis strap member is provided with ears L1 and a bolt extendsthrough these ears a nd through an eye in a bracket 12 which is carried by the supporting means the same as that which supports the bracket 9. This strap 11 is provided with cut-out portions as indicated at 1.1 which overlie the openings that are termed in the tubular member 1 so as to in no jvay interfere with the exhaust of the gases.

'The structure which has just been'described is highly effective for the purpose for which it is used and enables the tubular member to be made out of very light material because the edges 2 when brought together not only serve as a means by which a fastening may be etiected in forming the tube, but also form a stiflening rib and thereby permit the use of light gauge material. Additionally the holes through which the exhaust gases pass may be generally distributed throughout the surface of the tubular member and accomplish amore efficient and quieter discharge of the exhaust gases than in the'case of a single slot, as disclosed in my prior patent.

It will readily be appreciated that it is very desirable to have the gases from an internal combustion engine exhaust as silently as possible and by the structure which is about to be described, ll have found that I can accomplish the exhaust of the before mentioned gases even more silently than with the construct-ion which has heretofore been described.

In general, the construction comprises a double tubular structure in which there is a short tubular member placed within an outer tubular member, the outer tubular member being much longer than the first mentioned tubular. member.

.In the drawings such a construction is shown and" the shorter and inner tubular member is indicated at 13, which tubular member is in the present instance made of conical shape. Undoubtedly the conical shape of both the inner tubular member and the outer tubular member best serves the.

use for which it is intended, buta'similar effects may be obtained by the use of tubular -members arranged as shown, in which the form of the tubular members is other than conical and therefore 1 do not wish to be limited in this respect.

The tubular member 13 is provided in the menses wall thereof with a large number of holes or openings such as indicated at 14, these holes extending substantially from one end to the other of the tubular member 13.

At oneend the member 13 is provided with a neck 15 which extends within the cylindrical portion 4e of the outer tubular member. This neck 15 is provided with a plurality of cuts or slits 16 in the'same manner as is the. outer member 4:, and therefore the same adjustable feature to compensate for different diameters of the pipe 6 is maintained.

Additionally, the cylindrical portion t of the outer tubular member positions the inner tubular member with respect to the outer tubular member and no additional supporting means for the inner tubular member is renired.

he exhaust gases in pipe 6 first discharge into the inner tubular member 13 and these gases find exit through the holes or openings 14 and also through the inner end 01% themember 13 which is preferably left open. The exhaust gases discharged through the tubular member 13 as just described, pass to the interior of the tubular member 1 and are-in turn exhaust= ed through the openings formed in the wall thereof and through the free open end 1.

By themes of the two tubular members as described, the exhaust gases from the engine are much more effectively and quietly discharged against the atmospheric pressure,

Having described my invention, I claim 1. A mufiler for internal combustion engines comprising an elongated tubular member adapted to be attached at one end to the engine exhaust pipe, said member formin acontinuation of the exhaust conduit an serving as a pressure dissipating discharge section therefor, said member having apertures spaced: longitudinally along its wall.

from end to end to permit escape of gases directly therefrom tothe atmosphere whereby the pressure of each dischar e is dissi-' patedin its passage from the in ettoward the outer end of the tubular member, said apertures being greater in number per unit of-area at the central portion of the tubular memberl 2. A muflier for internal combustion engines comprising an elongated tubular memer adapted to be attached at one end to an engine exhaust pipe to form a continuation thereof and to serve as a pressure'dissi at ing discharge section therefor, the wal of said tubular .member having perforations from end to end to permit escape of gases directly to the atmosphere to dissipate the pressure of each discharge as itpasses from the inlet end toward the outer end thereof, and an open ended tubular member within the inlet end of the first tubular member through which gases are discharged from coming from the 1 the engine exhaust pipe, said second tubu lar member forming a continuation of the exhaust pipe passageway and having perforations in its Wall from end to end, the axial portion of said mufiler from its inlet end to its outer end being unobstructed.

3. A mufiler for internal combustion engines comprising an elongated conically shaped tubular member adapted to be attached at its larger end to an engine exhaust pipe to form a continuation thereof and to serve as a pressure dissipating discharge section therefor, the wall of said tubular member having perforations from end to' end to permit escape of gases therefrom directly to the atmosphere to dissipate the pressure of each discharge as it passes from the inlet end toward the outer end thereof, and an inner perforated conical tube Within the inlet end of the elongated tubular member, said inner conical tube having its larger end of substantiallv the same diameter as the exhaust pipe and forming a continuation thereof. said mufller being unobstructed along an axial line from the inlet end to the outer end thereof.

In testimony whereof, I hereunto aflix my signature.

THOMAS S. KEMBLE. 

